极冰气候效应的数值试验

利用一个大气环流模式（ＡＧＣＭ）和一个全球耦合海气模式（ＣＯＡＧＣＭ），模拟了北极海冰边界范围的变化对月平均气候的影响。结果表明，极冰边缘的异常完全可以改变中高纬度某些地区的局地气候。受冷源的影响，北半球中高纬度冷高压加强，低纬度暖高压减弱。同时利用一个全球三维大气环流模式，作了海冰反照率参数化的数值试验，用两种不同的海冰反照率参数化方案，检验对地表面温度、海平面气压、极地表面对太阳辐射吸收的影响。模拟试验表明了冰雪圈反照率的反馈作用，对气候变化的影响十分重要。

THE NUMERICAL EXPERIMENTS OF THE EFFECTS OF NORTH POLAR SEA-ICE ON CLIMATE

An atmospheric general circulation model (AGCM) and a global coupled ocean-at-mospheric model (COAGCM) are used to test the influence of boundary changes of the sea-ice in north polar region on the monthly mean climate variability.It is shown that the anomaly of the polarice can greatly change the local climate in mid-high latitude.The cole high in mid-high latitude is strengt hened and the warm high in low latitude is weakened.In addition,the sensitivity of at mosphere to sea-ica albedo is tested by using the AGCM.Two kinds of sea-ice albedo are used.The variation of solar absorption at sea-ice surface will make the ground surface temperature and the sea-level pressure varied.The results also show that the feedback of ice and snow is very important to the climate.